I think these are flawed opinions and not fact. Animals are not motivated to have sex out of fun or recreation. It doesn’t account for initial motivation, which I think is quite obviously instinct–not conscious anticipation of pleasure.
Cows mount other cows when they are in oestrus and it’s part of a range of behaviours incorporated into what is known as ‘bulling’. The purpose is to indicate to the bulls that the cow is receptive and fertile, nohting more. The cows certinaly don’t get off on it.